Hard disk drive with actuator latch

Description

[0001] The present invention relates to a hard disk drive with an actuator latch for locking a magnetic head in a parking region in a magnetic head transfer mechanism of the hard disk drive.

[0002] In general, as shown in FIG. 1, a hard disk drive includes a hard disk 20 and a magnetic head transfer mechanism. The hard disk 20, in which predetermined data is recorded, is rotatably installed on a base 10. The transfer mechanism transfers a magnetic head 50 to a desired track on the hard disk 20 to record and reproduce data. Here, the hard disk 20 is divided into a recording region 22 for recording data and a parking region 21 on which the magnetic head 50 arrives when the rotation of the hard disk 20 stops. The magnetic transfer mechanism includes an actuator 30, a voice coil motor, and a latch. The actuator 30, in which the magnetic head 50 is installed, rotates around a rotating axis 34 on the base 10. The voice coil motor rotates the actuator 30 with an electromagnetic force. The latch locks the actuator 30 after the magnetic head 50 arrives on the parking region 21. The actuator 30 includes a suspension portion 31, an arm 32, and a bobbin 33. The suspension portion 31 suspends the magnetic head 50. The arm 32 is roatably combined with the rotating axis 34. A movable coil 35 of the voice coil motor is wound on the bobbin 35. The voice coil motor includes the movable coil 35 and a magnet 41, which is attached to yoke 40 installed on the base 10 and generates a magnetic flux. The actuator 30 is placed between a pair of the yokes 40, not shown in FIG. 1. An electromagnetic force occurs due to the interaction between the magnetic force flux generated by the magnet 41 and current flowing through the movable coil 35. As a result, the actuator 30 rotates in a direction according to Fleming's left-hand law. The latch locks the actuator 30 so that the actuator 30 does not move after the magnetic head 50 arrives on the parking region 21 as described previously. The latch includes a magnetic member 43, a damper 60, and an iron separation element 61. The magnetic member 43 is installed on the yoke 40 and magnetized by the magnet 41. The damper 60 is inserted into a combination protrusion 36 at the end of the bobbin 33 of the actuator 30. The iron separation element 61 is coupled to an end of the damper 60. Thus, if the actuator 30 rotates and the magnetic head 50 installed at the suspension portion 31 enters the parking region 21 of the hard disk 20, the iron separation element 61 coupled to one side of the bobbin 33 sticks to the magnetic member 43 as shown in FIG. 1. The actuator 30 keeps being locked due to the magnetic combination of the iron separation element 61 and the magnetic member 43 until the electromagnetic force for rotating the actuator 30 operates again. The reason of locking the actuator 30 will be described below. The suspension portion 31 for suspending the magnetic head 50 provides an elastic force biasing the magnetic head 50 toward the horizontal plane of the hard disk 20. Thus, the magnetic head 50, to which an external force is not applied, keeps closely sticking on the horizontal plane of the hard disk 20. However, if the rotation of the hard disk 20 begins, air moves around the magnetic head 50 due to the rotation of the hard disk 20. The movement of air generates a lift force that lifts the magnetic head 50 from the horizontal plane of the hard disk 20. Thus, since the hard disk 20 is rotating when data is recorded on or read from the recording region 22 of the hard disk 20, the magnetic head 50 glides a predetermined distance above the horizontal plane of the hard disk 20. Thus, scratches due to the friction between the recording region 22 and the magnetic head 50 do not occur on the recording region 22. However, if the rotation of the hard disk 20 completely stops as when power is turned off, the lift force that lifts the magnetic head 50 disappears. Thus, the actuator 30 rotates so that the magnetic head 50 is positioned on the parking region 21 before the lift force disappears. As a result, the magnetic head 50 safely arrives in the parking region 21, which is not related to recording/reproducing data, and thus does not have a bad effect on the recording region 22 although the lift force disappears as the rotation of the hard disk 20 stops. However, if the magnetic head 50 is pushed toward the recording region 22 due to an impact after the magnetic region 50 safely arrives on the parking region 21, the magnetic head 50 keeps touching the recording region 22 until the magnetic head 50 is lifted again when the hard disk 20 is re-driven. As a result, scratches may occur on the recording region 22. Hence, in order to solve this problem, the actuator 30 is locked using the latch so that the actuator 30 does not rotate although the impact is inflicted.

[0003] However, in this conventional latch, the actuator 30 is locked by a magnetic force which couples the magnetic member 43 to the iron separation element 61. Thus, the actuator 30 is unlocked if a force greater than the electromagnetic force is applied. Also, the actuator 30 is unlocked and begins moving because the electromagnetic force generated between the movable coil 35 and the magnet 41 exceeds the combination force due to the magnetic force between the iron separation element 61 and the magnetic member 43 to re-rotate the locked actuator 30. And, if the magnetic combination force between the iron separation element 61 and the magnetic member 43 is too small, the actuator 30 easily unlocked even by a small impact. In other words, if the magnetic combination force between the iron separation element 61 and the magnetic member 43 is too small, the actuator 30 is easily unlocked even by a small impact. If the magnetic combination force between the iron separation element 61 and the magnetic member 43 is too great, the actuator 30 may not be unlocked even if the maximum electromagnetic force occurs to rotate the actuator 30. In the above-described structure, the actuator 30 springs out sharply due to inertia when the actuator 30 is unlocked by overcoming the magnetic combination force. Thus, the protrusion 36 may strongly crash against a stopper 42 opposite to the magnetic member 43. If the actuator 30 crashes against the stopper 42, head slap may occur due to the crash impact. Thus, to prevent the head slap, the application of current to the movable coil is controlled so that the actuator 30 is unlocked and supplied with a damping force. It is difficult to design a control system since the timing for unlocking the actuator 30 and supplying the damping force to the actuator 30 is accurately set. Also, due to repetitive locking and unlocking operations, the damper 60 is under continuous stress and it may be destroyed.

[0004] U.S. Pat. No. 4,692,829 discloses a locking structure adopting an aerodynamic latch member not a locking structure by the magnetic force combination of an iron separation element and a magnetic member for inhibiting a problem of head slap. In this locking structure, the aerodynamic latch member moves and an actuator is locked and unlocked due to wind occurring when a disk rotates. However, the sensitivity of moving the aerodynamic latch member must be accurate due to the strength of wind occurring when the disk rotates to prevent operation errors. Thus, an error in manufacturing and assembling the aerodynamic latch member should be minimized and a great burden is given in manufacturing the aerodynamic latch member.

[0005] U.S. Pat. No. 5,381,290 discloses a bi-stable mechanical latch for a disk drive actuator with a latch member, which comprises a first arm with a magnetic mass in the form of a steel ball and a second arm with a magnetic mass also in the form of a steel ball. The second arm further includes a latch coil mounted thereto. A tip portion of the actuator is shaped to nest into a hooked end of the first arm. To unlock the actuator, the latch coil is selectively energized, such that it produces a magnetic field of the opposite polarity as its assigned permanent magnet, such that the latch coil and therefore the second arm of the latch member is attracted thereto. However, this design comprises the drawback, that the coil is in the most distant position to its assigned permanent magnet at the beginning of the unlocking process, such that the generated magnetic field of the coil has to be relatively high, to be able to unlock the actuator.

[0006] To solve the above-described problems, it is an object of the present invention to provide a magnetic head of a hard disk drive having an improved structure to strongly keep an actuator locked and softly perform operations of locking and unlocking.

[0007] This object is achieved by a hard disk drive according to claim 1. Advantageous embodiments are disclosed by the subclaims.

[0008] The above object and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which:

FIG. 1 is a plan view of a hard disk drive including a conventional actuator latch;

FIG. 2 is a plan view of hard disk drive including an actuator latch according to the present invention;

FIG. 3 is a perspective view of a portion of the actuator latch shown in FIG. 2;

FIG. 4 is a plan view explaining steps of locking the actuator latch shown in FIG. 2; and

FIG. 5 is a plan view explaining steps of unlocking the actuator latch shown in FIG. 2.

[0009] FIGS. 2 and 3 show a hard disk drive including an actuator latch according to the present invention. Referring to FIG. 2, a magnetic head transfer mechanism includes an actuator 300 and a voice coil motor. The actuator 300 having a magnetic head 500 at an end thereof is installed on a base 100, on which a hard disk 200 is rotatably installed. The voice coil motor rotates the actuator 300 so that the magnetic head 500 moves on a parking region 210 and a recording region 220 on the hard disk 200. Here, the actuator 300 includes a suspension portion 310, an arm 320, and a bobbin 330. The suspension portion 310 suspends the magnetic head 500. The arm 320 is coupled to a rotation axis 340 on the base 100. A movable coil 350 of the voice coil motor is wound around the bobbin 330. The voice coil motor includes the movable coil 350 and magnets 410a and 410b. The magnets 410a and 410b are installed on a yoke 400 on the base 100 and generate magnetic flux. As shown in FIG. 3, the actuator 300 lies between the upper and lower yokes and magnets 410a and 410b. Thus, upper and lower magnets 410a and 410b form magnetic poles on upper and lower yokes 400a and 400b. Reference numeral 401 represents a connecting portion of the upper yoke 400a, which a lever 630 of a latch member 600 that will be described later is selectively attached to and detached from.

[0010] When the magnetic head 500 is positioned on the parking region 210 of the hard disk 200, a locking mechanism locks the actuator 300. The locking mechanism includes the latch member 600, a coil 640, and a power supply 650. The latch member 600 includes a locking protrusion 331 at the actuator 300, a hook 620, an impact portion 610, and the lever 630, and rotates on the basis of a rotation axis 601. The coil 640 is wound around the lever 630. The power supply 650 supplies the coil 640 with current. The lever 630 is formed of a metallic material having a magnetic polarity due to a short via the coil 640. The magnetic polarity reacts with the magnetic poles formed on the upper yoke 400a and serves as a driving force for rotating the latch member 600 if necessary. The impact portion 610 crashes against the locking protrusion 331, and is pushed when the actuator 300 rotates in a direction along which the magnetic head 500 enters the parking regions 210 so that the latch member 600 rotates simultaneously. In other words, the latch member 600 rotates with the rotation of the actuator 300 toward the parking side. As the latch member 600 rotates with the rotation of the actuator 300 toward the parking side, the hook 620 intercepts it in an opposite direction to the locking protrusion 331. In other words, the hook 620 prevents the locking protrusion 331 from returning to an opposite direction to the parking to lock the actuator 300. Reference numeral 602 represents an iron separation element installed opposite to the lever 630 on the basis of the rotation axis 601. The iron separation element 602 receives an attraction force from the magnets 410a and 410b of the voice coil motor and the yoke 400 to keep the actuator 300 unlocked.

[0011] In the above-described structure, if the hard disk 200 stops rotating when power is turned off, an electromagnetic force occurs due to the interaction between current flowing through the movable coil 350 and the magnetic flux generated from the magnet 410. Thus, as shown in FIG. 4, the actuator 300 rotates in direction C so that the magnetic head 500 enters the parking region 210. Here, the locking protrusion 331 pushes the impact portion 610 of the latch member 600 and rotates the latch member 600 in direction A. As a result, both ends of the lever 630, which is perpendicular to the latch member 600, are conjoined with the conjunction portions 401 of the upper and lower yokes 400a and 400b at the same time by a magnetic force (Refer to FIG. 3), and the hook 620 is located on a position for intercepting a moving path of the locking protrusion 331 in a D direction, i.e., opposite direction to the parking. As shown in FIG. 2, it is preferable that a contact surface between the locking protrusion 331 and the hook 620 is formed at a right or obtuse angle which forms an angle of 90° or more with a segment linking the end of the hook 331 and the rotating axis 601. Then, since the locking protrusion 331 does not slide from the contact surface, the actuator 300 can strongly keep locked. Thus, the locking protrusion 331 does not come off the hook 620 as long as the hook 620 is unlocked. As a result, the actuator 300 keeps stably locked after the magnetic head 300 is positioned on the parking region 210.

[0012] If the actuator 300 is unlocked to re-use the hard disk 200, the power supply 650 supplies the coil 640 with current to form the same polarity as the connecting portion 401 at an end of the lever 630 contacting the connecting portion 401. Thus, as shown in FIG. 5, the latch member 600 rotates in direction B, and the hook 620 is released from the locking protrusion 331. As a result, the actuator 300 is unlocked and thus rotates freely so that the magnetic head 500 is transferred to the recording region 220 of the hard disk 200. It is preferable that current flowing through the coil 640 stops to reduce current consumption after the actuator 300 is completely unlocked. Nevertheless, since the iron separation element 602 installed on the latch member 600 receives an attraction force from the magnets 410a and 410b of the voice coil motor and the yoke 400, the lever 630 does not come in contact with the connecting portion 401 as long as a predetermined external force is not applied.

[0013] Accordingly, the actuator latch according to the present invention is locked and unlocked when the hook 620 of the latch member 600 moves to a position for restricting the movement of the locking protrusion 331 of the actuator 300 or setting the locking protrusion 331 of the actuator 300 free. Thus, the actuator latch is more softly locked and unlocked than the conventional latch based on a magnetic combination. In other words, when the iron separation element 61 of FIG. 1 contacts the magnetic member 43 of FIG. 1 due to a magnetic force, the conventional latch comes apart from the magnetic member 43, and the locking protrusion 36 of FIG. 1 crashes against the stopper 42 of FIG. 1 due to inertia. Thus, the magnetic head 500 of FIG. 1 may be damaged. However, in the actuator latch of the present invention, if the latch member 600 rotates to set the locking protrusion 331 free, the actuator 300 can move freely. Thus, the actuator 300 is softly and stably unlocked. As a result, no impact occurs due to unlocking, and no structure for supplying a damping force simultaneously performing while unlocking to prevent impact is required. Also, after the actuator 300 is locked, the actuator 300 does not move at all as long as the latch member 600 does not rotate to be unlocked. Thus, the actuator 300 can keep strongly locked.

[0014] In this embodiment, the both ends of the lever 630 protrude over and under the latch member 600 and are conjoined with the conjunction portions 401 of the upper and lower yokes 400a and 400b. However, the both ends of the lever 630 may be conjoined with only any one of the upper and lower yokes 400a and 400b. In other words, any one end of the lever 630 may protrude to conjoin with the conjunction portions 401 and the other end of the lever 630 may be removed. However, as in this embodiment, if the both ends of the lever 630 are conjoined with the conjunction portions 401 of the upper and lower yokes 400a and 400b, locking is stably maintained. Also, since repulsive forces for unlocking occur at the both ends of the lever 630, the almost same forces as the repulsive forces can be obtained although less current is supplied. Thus, the structure of the lever 630 may be more efficient.

[0015] As described above, in an actuator latch of a hard disk drive according to the present invention, the movement of a locking protrusion at an actuator is selectively intercepted so that the actuator is locked and unlocked. The actuator can keep strongly locked and be softly unlocked without any impact.

Claims

1. A hard disk drive comprising a hard disk (200) rotably installed on a base (100), an actuator (300) driven by a voice coil motor and with a magnetic head (500) installed thereon, and an actuator latch for locking the actuator (300) when the magnetic head (500) is positioned in a parking region (210) on said hard disk (200), wherein said actuator latch comprises:

- a locking protrusion (331) installed at the actuator (300),

- a latch member (600) pivotably installed on the base (100) for pivoting about a predetermined rotation axis (601) together with the rotation of the actuator (300) in direction to the parking region (201), wherein a hook (620) is provided at the latch member (600) for intercepting the locking protrusion (331) and preventing it from moving in an opposite direction, and

- a coil (640),

characterized in that
the actuator latch further comprises a latch member driving means (630, 640, 650) including a lever (630) installed at the latch member (600) which is magnetically attracted by a yoke (200, 400a,b) of the voice coil motor when the hook (620) intercepts a locking protrusion (331), and
in case the actuator (300) is to be unlocked, a current is supplied to the coil (640) by a current supply (650) to produce a magnetic field of the same polarity as of the yoke (400, 400a,b) such that the latch member (600) is pivoted to set free the interception of locking protrusion (331) and hook (620).

2. The hard disk drive of claim 1, characterized in that an iron separation element (602) is installed at the latch member (600) opposite to lever (630) relative to the rotation axis (601) to receive an attractive force from the voice coil motor in particular to keep the actuator (300) unlocked.

3. The hard disk drive according to claim 1 or 2, characterized in that an impact portion (610) is formed at the latch member (600) to crush against the locking protrusion (331) and to be pushed thereby when the actuator (300) rotates in direction to the parking region (210) wherein the latch member (600) is pivoted simultaneously.

4. The hard disk drive according to one of the previous claims, characterized in that a contact surface between the locking protrusion (331) and the hook (620) is formed at a right or obtuse angle θ which forms an angle of 90° or more with a segment linking the end of the hook (620) and the rotating axis (601).

5. The hard disk drive according to one of the previous claims, characterized in that the coil (640) is wound around the lever (630).

6. The hard disk drive according to one of the previous claims, characterized in that the lever (630) has two ends to be conjoined with upper and lower yokes (400, 400a,b) and is perpendicularly arranged relative to the latch member (600).

7. The hard disk drive according to one of the previous claims, characterized in that each yoke (400, 400a,b) comprises a conjunction portion (401) to be conjoined with the ends of the lever (630).

8. The hard disk drive according to one of the previous claims, characterized in that the current flow through the coil (640) is stopped after the actuator (300) is completely unlocked.

Ansprüche

1. Festplattenlaufwerk, das eine Festplatte (200), die drehbar auf einer Basis (100) installiert ist, einen Zugriffsarm (300), der von einem Schwingspulenmotor angetrieben wird, an dem ein Magnetkopf (500) installiert ist, sowie eine Zugriffsarm-Verriegelung umfasst, mit der der Zugriffsarm (300) arretiert wird, wenn sich der Magnetkopf (500) in einem Parkbereich (210) auf der Festplatte (200) befindet, wobei die Zugriffsarm-Verriegelung umfasst:

einen Arretiervorsprung (331), der an dem Zugriffsarm (300) installiert ist,

ein Verriegelungsteil (600), das zum Schwenken um eine vorgegebene Drehachse (601) herum zusammen mit der Drehung des Zugriffsarms (300) in Richtung des Parkbereiches (201) schwenkbar an der Basis (100) installiert ist, wobei ein Haken (620) an dem Verriegelungselement (600) vorhanden ist, der den Arretiervorsprung (331) sperrt und verhindert, dass er sich in einer entgegengesetzten Richtung bewegt, und

eine Spule (640),

dadurch gekennzeichnet, dass

die Zugriffsarm-Verriegelung des Weiteren eine Verriegelungsteil-Antriebseinrichtung (630, 640, 650) umfasst, die einen Hebel (630) enthält, der an dem Verriegelungselement (600) installiert ist und von einem Joch (200, 400a, b) des Schwingspulenmotors magnetisch angezogen wird, wenn der Haken (620) einen Arretiervorsprung (331) sperrt, und

wenn der Zugriffsarm (300) entarretiert werden soll, der Spule (640) von einer Stromquelle (650) ein Strom zugeführt wird, um ein Magnetfeld mit der gleichen Polarität wie der des Jochs (400, 400a, b) zu erzeugen, so dass das Verriegelungsteil (600) geschwenkt wird und die Sperrung des Arretiervorsprungs (331) durch den Haken (620) löst.

2. Festplattenlaufwerk nach Anspruch 1, dadurch gekennzeichnet, dass ein Magnettrennelement (602) an dem Verriegelungsteil (600) relativ zu der Drehachse (601) dem Hebel (630) gegenüberliegend installiert ist, um eine Anziehungskraft von dem Schwingspulenmotor aufzunehmen um insbesondere den Zugriffsarm (300) entarretiert zu halten.

3. Festplattenlaufwerk nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Aufschlagabschnitt (610) an dem Verriegelungsteil (600) ausgebildet ist, der an den Arretiervorsprung (331) gedrückt und von ihm geschoben wird, wenn sich der Zugriffsarm (300) in Richtung des Parkbereiches (210) bewegt, wobei das Verriegelungsteil (600) gleichzeitig geschwenkt wird.

4. Festplattenlaufwerk nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass eine Kontaktfläche zwischen dem Arretiervorsprung (331) und dem Haken (620) in einem rechten oder stumpfen Winkel θ ausgebildet ist, der einen Winkel von 90° oder mehr mit einem Segment bildet, das das Ende des Hakens (620) und die Drehachse (601) verbindet.

5. Festplattenlaufwerk nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Spule (640) um den Hebel (630) herumgewickelt ist.

6. Festplattenlaufwerk nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Hebel (630) zwei Enden aufweist, die an ein oberes und ein unteres Joch (400, 400a, b) grenzen, und er senkrecht relativ zu dem Verriegelungsteil (600) angeordnet ist.

7. Festplattenlaufwerk nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass jedes Joch (400, 400a, b) einen Angrenzungsabschnitt (401) zum Angrenzen an die Enden des Hebels (630) umfasst.

8. Festplattenlaufwerk nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Stromfluss durch die Spule (640) unterbrochen wird, wenn der Zugriffsarm (300) vollständig entarretiert ist.

Revendications

1. Unité de disque dur comprenant un disque dur (200) placé avec une possibilité de rotation sur une base (100), un actionneur (300) entraîné par un moteur à bobine mobile et comportant, installée sur celui-ci, une tête magnétique (500), ainsi qu'un dispositif de verrouillage d'actionneur permettant de verrouiller l'actionneur (300) lorsque la tête magnétique (500) est placée dans une zone de parcage (210) sur ledit disque dur (200), ledit dispositif de verrouillage d'actionneur comprenant :

- une protubérance de blocage (331) placée au niveau de l'actionneur (300),

- un élément de verrouillage (600) placé avec une possibilité de pivotement sur la base (100) dans le but de pivoter autour d'un axe de rotation (601) prédéterminé en même temps que la rotation de l'actionneur (300) dans la direction de la zone de parcage (210), un crochet (620) étant prévu au niveau de l'élément de verrouillage (600) afin de saisir la protubérance de blocage (331) et de l'empêcher de se déplacer dans une direction opposée, et

- une bobine (640),

caractérisée en ce que
le dispositif de verrouillage d'actionneur comprend en outre un moyen d'entraînement de l'élément de verrouillage (630, 640, 650) incluant un levier (630) placé au niveau de l'élément de verrouillage (600) qui est attiré magnétiquement par un étrier (400, 400a, b)
du moteur à bobine mobile lorsque le crochet (620) se saisit de la protubérance de blocage (331), et
dans le cas où l'actionneur (300) doit être déverrouillé, un courant est appliqué à la bobine (640) par une alimentation en courant (650) afin de produire un champ magnétique de la même polarité que celui de l'étrier (400, 400a, b) de telle sorte que l'on fasse pivoter l'élément de verrouillage (600) pour rendre libre l'interception de la protubérance de blocage (331) et du crochet (620).

2. Unité de disque dur selon la revendication 1, caractérisée en ce qu'un élément (602) de séparation en fer est placé au niveau de l'élément de verrouillage (600) à l'opposé du levier (630) par rapport à l'axe de rotation (601) afin de recevoir une force d'attraction provenant du moteur à bobine mobile, en particulier pour maintenir déverrouillé l'actionneur (300).

3. Unité de disque dur selon la revendication 1 ou 2, caractérisée en ce qu'une pièce de choc (610) est formée au niveau de l'élément de verrouillage (600) afin de venir s'accrocher contre la protubérance de blocage (331) et d'être poussée de ce fait lorsque l'actionneur (300) tourne en direction de la zone de parcage (210) dans laquelle on fait simultanément pivoter l'élément de verrouillage (600).

4. Unité de disque dur selon l'une des revendications précédentes, caractérisée en ce qu'une surface de contact située entre la protubérance de blocage (331) et le crochet (620) est formée à un angle θ droit ou obtus qui forme un angle de 90° ou plus avec un segment reliant l'extrémité du crochet (620) et l'axe de rotation (601).

5. Unité de disque dur selon l'une des revendications précédentes, caractérisée en ce que la bobine (640) est enroulée autour du levier (630).

6. Unité de disque dur selon l'une des revendications précédentes, caractérisée en ce que le levier (630) comprend deux extrémités devant être liées avec les étriers supérieur et inférieur (400, 400a, b) et qu'il est disposé perpendiculairement par rapport à l'élément de verrouillage (600).

7. Unité de disque dur selon l'une des revendications précédentes, caractérisée en ce que chaque étrier (400, 400a, b) comprend une partie de liaison (401) devant être liée aux extrémités du levier (630).

8. Unité de disque dur selon l'une des revendications précédentes, caractérisée en ce que la circulation de courant au travers de la bobine (640) est arrêtée après que l'actionneur (300) est complètement déverrouillé.

Drawing